液压油量低于___时需要补加液压油？

He wishes ___ mistakes.

We ___ our lives had it not been for the policeman.

I was busy yesterday, otherwise I ___ your birthday party.

Supposing I ___ this gift, what would he say?

It is important that I ___ with Mr. Willians immediately.

He insisted that John ___ it.

He spoke in a quiet, distinct voice, as though his thought _____

If it ___ tomorrow, what would we do?

If it ___ rain, we ___ get wet.

It is required that you ____ at six.